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It needs to be stressed that the RATE group recognises that there is physical evidence in the rocks that massive amounts of radioactive decay have occurred through the earth's history, and that there is a systematic trend in the radioisotopic 'ages' of the rocks in the geologic record from oldest at the bottom to youngest at the top.
However, there are many anomalies and there is much evidence of radioisotopic inheritance and mixing because of global tectonic processes having stirred the mantle and added magmas to the crust, which has likewise been stirred by the crustal rock cycle.
Firstly, supernovae have not added a significant amount of new elements to putative star-forming clouds.
If they had, the ratio would be different in various stars.
In particular, because of the way mass and energy are related, they could not have been at variance from our present day observations by any more than one part in ten million; otherwise the natural reactor would not have functioned. I Shylakhter, Nature, 264, 340 (1976) and F Dyson and T Damour, "The Oklo Bound on the time variation of the fine-structure constant revisited", Nuclear Physics, B480 37 (1997) Any significant variation in the relationship between mass and energy - the only variables that determine the speed of light in Einstein's famous e = m c squared - would have to be dated prior to 1.8 billion years ago, based on this witness from God's creation. My reply on those pages was sparked by a question about Oklo and other ore bodies by Bob Gentry.
My thought is, can the relative natural abundances of these chains' terminal products (Pb208,207, and 206) be used to calculate an initial abundance and time frame for the original atomic abundances of the parent isotopes which could be compared to the predictions of Willie Fowler regarding stellar nucleogenesis processes. Thanks again for all your interesting and informative web postings and work.
Setterfield: I believe that it is possible to determine the initial ratios of the parent elements in the various chains.
Setterfield: There is a discussion of the effects of radioactive decay and natural ore bodies in Ex Nihilo Technical Journal Vol. The basic fact about Uranium ore bodies is that they need slow neutrons to be captured by the uranium nucleus in order to produce the reaction.
It is for that reason that water was needed at Oklo to slow the neutrons down sufficiently for the ore body to start a chain reaction.